If you answered "yes," there's a reason for that. Identical twins show up far more frequently in fiction than fraternal (non-identical) twins. If you don't believe us, take a Wiki Walk through Twin Tropes. We'll wait.

Welcome back! So why are fictional twins always identical? Well, for starters, identical twins are visually striking. They allow for comic plots, and they add symmetry and symbolism to a story. An Evil Twin is almost always an Identical Twin; how else could they impersonate the "good" twin? Fraternal twins, for all intents and purposes, are just regular siblings, and regular doesn't cut it in fictionland. Oh yes, and if it's an animated film or series, that makes it one less character for the artists to design and learn to draw.

Chalk this up to the Law of Conservation of Detail — if they're not identical, there's usually no need to establish them as twins rather than just siblings.

If the twins are conjoined, they will most certainly be identical, as this is the case in Real Life, although fiction often allows for the possibility of non-identical, or even opposite sex, conjoined twins, generally for the Rule of Funny.

In reality, fraternal twins are significantly more common than identical twins — only 8% of twin births are identical, or 0.1% of all births. But how would it look if in fiction only one character in a thousand had an identical twin?

Examples of Identical Twins:

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In a series of commercials for State Farm insurance, Los Angeles Clippers point guard Chris Paul plays both himself and his (fictional) Separated at Birth twin Cliff, an insurance agent who was likewise born to assist.

Ouran High School Host Club has the Hitachiin twins, who are so alike that no one had ever been able to tell them apart until they met Haruhi. Of course they use that similarity for their own amusement, but it's also implied that it's also the reason they can be a bit bitter and cynical.

Horitsuba Gakuen has the above mentioned twins as well as Syaoran and Syaoran. In the actual series they're clones but the Alternate Universe extra portrays them as identical twins. To make it even weirder in the main series Syaoran technically does have a twin — Watanuki, but the two of them are not identical at all.

It is fairly common in most harem-type series to have a pair of identical twins as part of the cast.

Played with in Eyeshield 21. Agon and Unsui dress and act very different from each other and whether they were fraternal or identical was left somewhat ambiguous for most of the series (although covers made it clear they are identicals). However after Agon gets a haircut, everyone is amazed to see he and his brother are very much identical.

Played with in Maomarimo: Mao and Ako remain fraternal twins even after Mao's Gender Bender, but the issue is raised by a background character who wonders why this trope wasn't invoked when Mao became a girl. Technically, Mao isn't Ako's twin (though it's plot-relevant that they were born on the same day) but Mao doesn't know he was adopted (and Ako is concealing it for reasons of her own) so their classmate gets a lecture on the difference between fraternal and identical twins instead.

Takuma and Kazuma from Gakuen Babysitters look exactly alike, though they are easy to tell apart once one looks at their faces and judge their temperament; Takuma is perpetually cheerful and Kazuma is perpetually tearful.

One episode of Sherlock Hound has Sherlock and Watson dealing with a pair of twins, one is a navy commander and the other is an insane treasure hunter.

Futakoi is all about this trope. There are six pairs of identical twins in the same series.

In Saki, Kana has three younger sisters- Shirona, Nazuna and Hina- who appear to be identical triplets. She often has to care for them, and while they don't show up much in the series proper, they often appear in Saki Biyori.

Bleach: A major plot-point in the final arc centres around two brothers who are completely indistinguishable from each other. Their powers allow them to mimic the forms of others, an ability they discovered before birth when they learned to mimic each other. They were thus born visually identical. Loyd is killed when he mimics Kenpachi's sealed form. Kenpachi has to remove his eyepatch to grow stronger than the form of himself Loyd is using. However, Royd is mimicking Yhwach, so when the eyepatch-free Kenpachi confronts Royd, Royd instantly defeats him with his bare hands. He goes on to fight toe-to-toe with Yamamoto. Yamamoto does manage to kill him, but not before using all his power, including bankai, which allows the real Yhwach to kill Yamamoto.

Tomomi and Mikage are identical twins with psychic powers. Tomomi has Boyish Short Hair and wears more tomboyish clothes than her sister, so the fact they're identical is slightly less apparent than other examples.

Tomomi and Mikage's mother and their aunt are identical twins.

Partway through the manga, the plot involves a European country where the crown is ruled by identical twin queens and has been for centuries. One of the twins however is missing. Her sister is looking for her in order to kill her so that she can be the sole ruler.

Kimi to Boku features identical twins Yuta and Yuki Asaba as two of the main characters. They're both stoic, but Yuki is Brilliant, but Lazy and an otaku while Yuta is sarcastic and mature. The twins also have slightly different hairstyles.

In the sequel to Brave10, Nanakuma is introduced by Kamanosuke intercepting him and demanding answers thinking he's his teammate Rokuro as they are identical in everything but the colour scheme of their Coordinated Clothes (white and indigo, and black, respectively). Seeing the two together shocks many of the other characters as historically one twin would often be killed at birth for superstitious reasons so the sight really is rare.

Wendy and Goldie, twin prostitutes from Frank Miller's Sin City. According to Marv, they even smell identical. Granted, he is insane and at one point, even mistakes one twin for the other despite knowing full well she was dead.

A strange example are Thompson and Thomson who, apart from their moustaches, look exactly like twins. They dress, act and move the same and often finish each others' sentences. They also appear to live in the same house and even in the same bed! Still the linguistic difference in the spelling of their name suggest they are not related to each other at all. Furthermore, in the original French, they were known as Dupont & Dupond, which are even pronounced identically — this was kept up at least to some extent in most translations, including English, where they are known as Thompson and Thomson.

A better example are Alfred and Nester Halambiek in King Ottocar's Sceptre, who are a good and evil twin, looking exactly alike, save for the fact that the good one smokes and is far-sighted.

Girl's comics had quite a few examples, such as "Last Chance for Laura" from Bunty or "The Two-In-One Taylors" from Mandy. Being identical would enable them to perform a Twin Switch every now and then.

Richie Rich: Upon learning of a poor country where kids can legally get married, Mayda Munny lures Richie there under the pretense of making a movie to help them. Her plan fails because the Justice of Peace, having a real marriage to officiate when Mayda had her "fake" one to Richie, sent his twin brother to perform his role in the "movie".

Arawn: The four sons of Siahm are two sets of identical twins spawned from a different father. Math and Kern were the sons of her husband Dag, Arawn and Engus were the sons of her rapist Bran. Each one looks identical both to their twin and their sire.

In one of the comics based on the DC Animated Universe, specifically on Batman Beyond, Terry is surprised to find his former "Catwoman" has turned back to crime after swearing to go straight... especially when she doesn't have injuries she sustained during her latest heist. Turns out it's not her; both her parents had identical twins, and their daughter came out looking a lot like her.

Fairy Tales

In "The Two Brothers", collected by The Brothers Grimm, a poor man has two children, "who were twin brothers and as like each other as two drops of water." It takes nearly the entire story for this to become plot relevant, but it eventually does when one brother goes missing and the other is mistaken for him when he comes to find out what happened to him.

The Pony POV Series has Bonbon and her sister Moth. Justified because Moth isn't really her twin sister, she's a benign Changeling (unknown to Bonbon), though she still loves Bonbon like a sister.

In the Dark World, Apple Pie had an identical twin named Poison Apple, though they had different Cutie Marks. Unfortunately, Poison Apple was killed by Fluttercruel. She comes Back from the Dead in the end though.

Mary Kate and Ashley Olsen in everything they've done (except Full House, where the twins both played the same character to stretch limits on how long very young child actors are allowed to work). They're actually fraternal twins, but look alike enough for identical-twin plots to work. However, as is often the case they started growing out of their Strong Family Resemblance as they approached adulthood.

Both versions of The Parent Trap. Notable that at least the twins start out easily distinguishable in appearance and general behaviour. It's only after weeks of training and studying that they're able to impersonate each other.

In Pacific Rim, the Chinese pilots of Crimson Typhoon are played by real-life identical triplets the Luu Brothers. As well, the American Jaeger pilots of Romeo Blue, Bruce and Trevin Gage, were identical twins.

The Prestige: Borden and Fallon. In this case, they've been working for their whole lives to pass as each other.

In the Disney film Hot Lead and Cold Feet, long-lost identical twins are reunited by the death of their father. He's not actually dead, however; he just wants to get his boys back together. Hilarity Ensues.

Literature

Harry Potter: Fred and George Weasley and the Patil sisters. In the films, this trope was both confirmed by the Weasley brothers (played by real life identical twins James and Oliver Phelps) while averted in the fraternal twin Patil sisters, who were played by unrelated (though similar looking) actresses.

Protagonists Jessica and Elizabeth Wakefield. As repeated in every book, they're only distinguishable by a mole Elizabeth has on her shoulder and Jessica doesn't. Also, Elizabeth wears a watch and Jessica doesn't, and Elizabeth has a more modest clothing style as opposed to Jessica's more sexy and fashionable clothes. They frequently even fool their parents by posing as each other.

The identical evil twins Nora and Margo, who other than hair color are so like Elizabeth and Jessica that they're even able to fool the other twins' parents.

Subverted in Honor Harrington: while the Detweiler brothers look like identical sextuplets, they are, in fact, clones of their father.

Elladan and Elrohir of The Lord of the Rings are not outwardly stated as being twins or even identical, but because their birth year is the same and elves wait at least ten years between children, they are assumed to be twins. They are also said to be "So much alike were they, the sons of Elrond, that few could tell them apart: dark-haired, grey-eyed, and their faces elven-fair, clad alike in bright mail beneath cloaks of silver-grey."

Tolkien also has Amrod and Amras, the youngest sons of Feanor from The Silmarillion: "twin brothers, alike in mood and face."

Elrond himself was a twin; however, the text doesn't say they were identical, and after Elros chose to become mortal and age they became less so.

"The twins" (No Names Given) in Peter Pan, "who cannot be described because we should be sure to be describing the wrong one." Note that Peter doesn't really know what "twins" are, and the animated series Peter Pan & the Piratessubverted this trope by making the twins different colors and heights, the implication being that they're merely good buddies who were labelled "twins" because they are always together and finish each other's sentences.

Lottie and Lisa in Erich Kästner's novel Das doppelte Lottchen who are so identical-looking that when they switch places, their own parents don't realise they've gone home with the wrong child, even though they don't even like the same food, aren't good at the same things at school, and Lisa doesn't know how to cook.

Enid Blyton's St. Clare's series has twins Pat and Isabel O'Sullivan. They do look alike, but their classmates can recognize them.

Nypre and Deren, the first two characters introduced in the Stories of Nypre are identical twins, though its never been said if they are so identical as to be indistinguishable from one another.

In Mockingjay the Star Squad includes identical twin sisters whose first names are never revealed. Katniss and the other characters simply refer to them as "Leeg 1" and "Leeg 2".

Averted in First Light when Thea was told that the three girls on her locket were Lana, her mother, and her mother's twin who left the community with her twin. This was important because there could only be two girls born to any mother.

Devil's Cape has a pair of identical twin brothers with identical superpowers, one working for their uncle in organized crime and the other as a superhero.

Stefania and Apollonia in The Girl from the Miracles District. Both are blonde, statuesque women who are nigh-identical in personality and run night clubs, though Stefania's Terra Del Fuego provides more racy content than Apollonia's Music Box.

The Babysitters Club has a few sets of twins, almost always identical. Early books mention the Shillabers, Miranda and Mariah, friends of Mary Anne and Kristy; sitting clients Marilyn and Carolyn Arnold grow tired of their mother treating them like a single entity; and club member Abby has an identical twin named Anna.

Live-Action TV

Subverted in Our Miss Brooks, when Connie Brooks impersonates her nonexistent twin sister Bonnie so she can moonlight at a diner.

Tia Landry and Tamera Campbell on Sister, Sister are long-lost identical twins, played by real life twins Tia and Tamera Mowry. For a while producers even had one twin wear a fake mole to match the other, but they eventually abandoned this. The fifth season's main goal was to distinguish the sisters' personalities even more.

Emily and Katie Fitch from Skins are identical twins, played by real life twins Kathryn and Megan Prescott respectively.

A set of British twin girls were recurring characters too. Naturally they go on double dates with Zack and Cody.

The title characters of Liv and Maddie are, by contrast, played by one actress, Dove Cameron.

Nearly every set of twins in The Pretender, from regular character Sydney and his brother Jacob down to the briefest one-off appearance. Particularly notable was the episode where Sydney visits a Twins Convention, which is populated entirely by identical twins sticking together and wearing coordinated outfits.

The Bold and the Beautiful had a rather interesting example. Twins Stephanie and Phoebe Forrester were identical twins until they graduated high school. From that point on they've been fraternal.

Friends: Phoebe and Ursula, which allows various friends and colleagues to mistake them for each other in Ursula's first episode. Amusingly when they think Phoebe is doing porn movies, Joey refuses to watch the video. But when they discover it's actually Ursula, he has no problem. The twin thing was a Throw It In! moment, as Lisa Kudrow initially played Ursula on Mad About You, and then was cast in Friends. In order to 'explain' why Lisa was on two shows at once, the network made Phoebe and Ursula twin sisters.

Power Rangers Zeo has the character Trey of Triforia (also known as the original Gold Ranger). He is an alien whose race are composed of three separate entities that are normally unified as one, but due to being injured in battle cannot keep his singular form and has to appoint a successor to his Gold Ranger powers while he recovers. The Treys are played by identical triplets Ted, Tom and Tim Di Filippo. This series also introduces Tommy's twin brother David.

Professor of Surgery Sir Geoffrey Loftus is revealed to have an identical twin brother, Captain Norman Loftus, in the first episode of Doctor at Sea, so that when Drs. Waring and Stuart-Clark sign on as ship's surgeons, they will still be serving under a Loftus (and in contrast to the Bingham triplets, the Loftus brothers are very similar in personality).

Eventually, this was averted in a strange way. After several recasts, the original Marley actress returned, but Vicky was not recast. The explanation was Marley had an accident that resulted in Magic Plastic Surgery that somehow also left he several inches taller than she'd been before the accident.

Once Upon a Time reveals that the real Prince Charming is actually dead, and he's being impersonated by his identical twin brother (who was raised as a peasant).

Parodied in Scrubs with a set of identical twin brothers who dress the same, and are even both gay. They get offended when Elliot can't tell them apart, assuming it's because they're black.

Faking It: Zigzagged. Petra and Pieter, the first twins who appear, are an obvious subversion since they're female and male. Later though Lauren has a pair of female twins as her latest "New Lisbeths".

Orphan Black: It turns out that of the numerous clones, two (Sarah and Helena) are actually twins. Their birth mother was implanted with an embryo like all the others, but it split inside her. In this case it's justified that they're identical; fraternal twins are when two eggs are fertilized at the same time, which of course was impossible in this case.

The Indian Detective: Mumbai's "Terror Twins", Gopal and Amal Chandekar. They look identical, though their respective accents reflect where they stay most often (the former is based in Mumbai, the latter in Toronto).

Music

L and R Nomura of Marginal #4. They have different hair colors - yellow and green, as part of their unit's color motifs, but besides that they're almost completely identical. It isn't stated whether or not both of them have their natural color.

Tabletop Games

The Ravenloft setting has Laurie and Gennifer Weathermay-Foxgrove, identical twin monster-hunting heiresses, as well as Jacqueline and Louise Renier, identical wererat littermates.

Theater

The mix-up in The Comedy of Errors is caused by two sets of identical twins confusing themselves for each other.

Lucas and Claus from MOTHER 3. The game's narrative (as well as its inspiration) make it excessively clear that the two are meant to be completely identical, though they are curiously depicted with different hair colors—Claus ginger and Lucas blonde. Ironically enough, there's a perfectly good explanation for this if one considers them to be human chimeras—in the genetic sense. The game makes it a point to mention numerous times how indistinguishable the twins look regardless of this art direction.

One of the most recurring trainer classes in Pokémon is the "Twin" class, which features identical twin girls somewhere between 4 and 7.

Caroline and Justine in Persona 5: the only differences in their appearance are different hairstyles and which eye they wear their eye patches on. However, this is actually a subversion: the reason they look alike is because they are literally two halves of the same person.

Visual Novels

Shion Sonozaki from Higurashi: When They Cry uses this to her advantage, as she assumes her sister Mion's identity to manipulate as well as to cover up murder in the Watanagashi and Meakashi arcs. Her sister did the opposite, more jokingly, in the same arcs. The two twins also switched identities when they were younger. Shion is technically the older twin, Mion, but has to live permanently as Shion since her little sister was branded with a tattoo instead of her.

Girl Genius: Sun Mingmei and Sun Daiyu are identical since they were originally intended to be the same person before an overlooked error was pointed out to the authors and Kaja loved the idea of resolving it by making them twins.

El Goonish Shive plays with this: Susan and Diane are heavily implied to be twins, although they have different hair colors and heights. However, one of them had recently gone through an intense magical awakening, which resulted in her getting a growth spurt and the change of her natural hair color. Originally both girls were blonde, and one of them dyed her hair.

Magical 12th Graders: Sort of. Yeorum and Gyeowul are not twins, but they look nearly identical despite being a year apart. The "Gyeowul" running around is actually an older version of Yeorum, and not even Yeorum notices.

Alice and the Nightmare: Deetran and Dumquil Vena are almost literally mirror reflections of each other, save for their scars.

Sherri and Terri, two girls who go to the local elementary school and are in Bart's class.

Marge's older sisters, Patty and Selma Bouvier, are identical twins, so they're mostly the same in physical appearance and even their personalities; but their haircuts, dresses and even their sexualities are different (Patty eventually came out as a lesbian while Selma's heterosexual and has been married numerous times). Also, Selma has an adopted daughter from China named Ling and is the somewhat nicer twin; for example, when it comes to Marge's husband Homer, Selma has sometimes been shown to be a bit more willing to put up with him than Patty is.

It's revealed in one episode, however, that Patty and Selma are not identical. Their gray hair is actually the result of years of tobacco smoke and ash buildup; when they clear this debris from their hair, it's shown that one is blonde and the other has red hair.

ATLA also had a set of twins in the episode "The Fortuneteller," who were identical except one was an Earthbender and one wasn't.

Kim Possible's little brothers are identical twins who can only be told apart by the colour of their shirts.

The Scottish Twins from Thomas the Tank Engine zigzag with this trope. In their backstory the twins intentionally removed their number plates so as to appear completely identical and pull a Twin Switch and escape from a railway that threatened to have them scrapped. After being employed at Sodor, though, they were given number and name plates, specifically so they could be told apart.

Soon after, the twin tank engines Bill and Ben were introduced, and often use Twin Switching to prank other engines.

Andy and Ollie Pesto from Bob's Burgers, although the former is distinguishable from the latter by noticeably longer hair.

It's noted in The World of David the Gnome that gnomes always have twins when they have children. The trope is both played straight and subverted, however; some of the twins shown in the cartoon are identical, while others are fraternal.

Real Life

The village of Kodhini, India has 6 times as many twins as the global average. On top of that, the majority of the twins are identical.

The Bella Twins had to take some steps to make this work when they started their identical twin model careers. As Nikki has a naturally more voluptuous frame than Brie, she had to do daily ab and cardio workouts to match her sister's waifier body type. As both twins turned 30, however, they abandoned this. Nikki got breast implants and started powerlifting, giving her Amazonian Beauty. However even when they were identical, there were still notable facial differences that a good eye could spot.

Dueling advice columnists Abigail Van Buren and Ann Landers were identical twins; their real names were Esther Pauline and Pauline Esther. As teenagers, they pulled Twin Switch pranks frequently and even sometimes went on dates in each other's place.

In Corsair, fraternal twins Aura and Leti are clearly related yet distinct, with Leti taking much more after their father's side and Aura taking more after their mother's side.

"Syaoran Li" and "Watanuki Kimihiro" aka "Tsubasa Li 1" and, presumably, "Tsubasa Li 2 of Tsubasa -RESERVoir CHRoNiCLE- and xxxHoLic are a particularly notable example, being that they're not identical despite one of them being a time travel duplicate of the other.

Gundam SEED's Kira and Cagalli, being largely based on Luke and Leia. In addition to being non-identical, one is a genetically engineered superman and the other is completely unaltered.

Kagami and Tsukasa Hiiragi from Lucky Star are fraternal twins who are drawn to have very different eye shapes (Tsukasa has Tareme Eyes and Kagami has Tsurime Eyes) and they also have different hairstyles. However, they do look more similar to each other than to any of their other family members, at least as far as their hair and eye colors are concerned.

Bleach: Yuzu and Karin Kurosaki are twin sisters but are the complete opposite of each other. Yuzu is a pale-haired homemaker who gets excellent grades in school. Karin is a tough, dark-haired tomboy who leads her male peers in football. Yuzu resembles their mother Masaki while Karin resembles their father Isshin.

In High School Star Musical Otori and Hiiragi are revealed to be not just brothers, but fraternal twins, separated by their grandfather, who needed an heir.

Rin and Yukio Okamura from Blue Exorcist are fraternal twins who — despite looking somewhat alike when you take away Yukio's glasses — are opposites in pretty much everything, up to and including Rin being (half-)demon and Yukio being human. This didn't stop the fandom from going nuts with Twincest.

Momiji and Kaede Fujimiya of Blue Seed are not only fraternal, they don't even resemble each other all that much. But their twinship is very important, because by being twins they split the power of the Kushinada,

Bossun and Tsubaki from Sket Dance are eventually revealed to be twins who were Separated at Birth. Nobody noticed this before the revelation. Especially since Tsubaki is characterized by his long eyelashes, which Bossun don't have, and he also wears contacts, making them look less similar than they should be. However, with proper modifications, they're apparently similar enough to perform a convincing Twin Switch.

The Kamishiro twins from Yu Gi Oh Zexal, Ryoga/Shark and Rio, are twins with different gender. Since it's Yu-Gi-Oh!, they don't look even like they are related just like most siblings from the franchise, that's why they look more like lovers than siblings to the fans. Shark and Rio's dissimilarities are a huge contrast to the Half-Identical Twins from Yu-Gi-Oh! 5D's, Lua and Luca.

Suiseiseki and Souseiseki from Rozen Maiden are designed to be twins and they have the closest relationship among all seven sisters. While they do look similar, Suiseiseki has Rapunzel Hair and wears a green dress while Souseiseki has Boyish Short Hair and wears a blue suit. Their Mismatched Eyes also mirror each other's eye colors.

Dragon Ball Super: It is revealed that there are twelve universes, but they are six pairs of twins. If the sum of their numbers is 13 (1+12, 4+9, 6+7, etc), those pairs are determined as twins. However, it is shown that Universe 7 and Universe 6 aren't identical. While both have a planet Earth, the Earth from Universe 7, which is the home planet of Goku and the others, is still full of life, while the Earth from Universe 6 is devoid of life due to the Earthlings blasting the entire thing in a devastating war.

Beerus and Champa, who are the Gods of Destruction of their respective universes, are both humanoid, purple cats. But Beerus is skinny, while Champa is fat.

Go! Go! Itsutsugo Land! averts the trope with a set of Quintuplets, all of which are radically different in apperance and personality.

Though Yuri!!! on Ice plays this straight with the Nishigori triplets, it's averted with Michele and Sara Crispino, who are fraternal twins; aside from having the same purple eyes and dark skin tone, they don't look much alike.

Averted in the case of Natsume and Orie Sendawara; Natsume is far more outspoken and aggressive than Orie, and tends to dress in quite provocative outfits, whereas Orie is calmer, meeker and tends to go for a cuter style. However, both of them are gourmets with extremely sensitive palates and have no hesitation whatsoever when it comes to shooting down unworthy efforts.

Defied in the case of the Aldini brothers, with several characters expressing shock at the fact that the two are even related, much less twins. Takumi is short, slender, blonde, blue-eyed, artistic, sensitive and highly strung. Isami is tall, stocky (most of the time), brown-haired, brown-eyed, calm, down-to-earth and practical.

One Piece: The three sons who are born directly after Perospero are triplets: Katakuri, Daifuku and Oven. Aside from being massively huge and muscular, none of them resemble each other. They rather look like lost relatives of other characters instead. Their dissimilarity is even mirrored in their Devil Fruit abilities (Katakuri is a Logia-type user who can turn into mochi, Daifuku can summon a genie, and Oven has heat powers).

Comic Books

Ember and Suntop from ElfQuest, who are respectively a girl and a boy and have different hair colors (Ember is a redhead while Suntop is blonde).

Scarlet Witch's twin boys eventually manage to straddle the line: they're absolutely identical in features and build, but have inherited the different coloring and power sets from their mother and uncle (Wiccan from Scarlet Witch, Speed from Quicksilver). For extra fun, they're not blood-related, for bizarre reasons of magic and time-traveling reincarnation.

Pre-Crisis, Wonder Woman used to have a twin sister called Nubia. They were two different races (apparently due to being made of different colors of clay) and Nubia had darker hair.

Crash and Eddie the possums in Ice Age have almost the same personality and look very similar, but are obviously fraternal twins since Eddie has brown eyes, while Crash has blue eyes and a light stripe on his nose.

Tinkerbell and Periwinkle from Disney Fairies are twins but look vastly different. They have the same nose, though.

Films — Live-Action

Luke and Leia from the Star Wars saga. They were Separated at Birth after their mother died by their birth to protect from the Dark Side, especially since their father joined it. That's why they didn't know that they were twins when they first met each other. Granted, they were also established as twins later in the series, after the actors had already been cast.

This is the High Concept underlying the film Twins, with the titular twins being played by Arnold Schwarzenegger and Danny DeVito

The MacManus brothers from The Boondock Saints are fraternal twins, and in a deleted scene, they are seen conversing with their mother and asking which one of them came out first.

Castor and Pollux from The Hunger Games: Mockingjay aren't explicitly stated to be twins, but their names certainly imply it. And while the way they're described in the book makes it possible that they're identical twins, in the movies they're clearly not.

In Cheaper by the Dozen remake, two of the girls are fraternal twins (the family also includes a pair of identical male twins).

House of Wax (2005) has brother and sister twins as its protagonists. Rather than going down the Half-Identical Twins route, they don't look that similar. Nick for example is blond and Carly is brunette.

Literature

In L. M. Montgomery's Anne of Green Gables series, among Anne and Gilbert's children are fraternal twins Anne and Diana, nicknamed "Nan" and "Di." Dark-haired Nan inherited her father's looks and her mother's wild imagination, while Di has her mother's red hair but in temperament is described as "very much her father's child." The fact that they are not identical baffles many of their peers and forms a minor plot point in Anne of Ingleside when a mischievous girl convinces the young Nan that all twins are identical, and the reason Nan doesn't look like her twin is that she was Switched at Birth.

One Lonely Night by Mickey Spillane. A radical politician campaigning against corruption and Dirty Communists hires Mike Hammer to catch his insane twin brother who committed a murder in public in apparent attempt to destroy his reputation (fortunately the politician was giving a speech before hundreds of people at the time). Mike discovers the brother is a fraternal twin who doesn't look anything like the politician, who hired a look-alike actor to give the speech and committed the murder himself.

In The Famine Secret by Cora Harrison, the protagonists are a set of twin sisters - Deirdre and Fiona. Deirdre has blue eyes and brown curls, while Fiona has brown eyes and blonde locks. Deirdre resembles her younger brother more than her own twin sister. A paragraph from the POV of the matron has her wondering if they're actually twins, since they're not even the same height.

According to the Frozen book A Frozen Heart, Hans has twin brothers. Rudi is of average height and has reddish hair similar to Hans, while Runo is very tall and has pale blond hair. Runo is the only blond out of the thirteen brothers.

On Get Smart 99 gave birth to twins in the final season; it never came up whether or not they were identical, but given that they were boy & girl it is safe to assume they are fraternal because it is impossible for them to be genetically identical.

The Bold and the Beautiful had a rather interesting example. Ridge and Taylor's daughters Steffy and Phoebe were identical twins and played by identical twins up until the point where the characters left for London. Phoebe is the first to return, now played by a new actress. When Steffy returns a while later she is played by a different actress than Phoebe and the twins are now fraternal.

The Big Bang Theory has Sheldon and his twin sister, Missy, who look nothing alike except for hair color.

In the Elementary episode "While You Were Sleeping," when Sherlock Holmes learns that Yvette Ellison, a coma patient identified as a murderer by a witness, has a twin sister called Rebecca, he automatically suspects Rebecca of being the killer. He is very surprised to learn that Yvette and Rebecca are fraternal twins who look different enough that no one would mistake one for the other. Yvette is the killer. Her coma is medically induced to provide her with an alibi for the murders of all her siblings.

One of the big reveals in Heroes Reborn is that main characters Tommy and Malina are in fact, fraternal twins who were Separated at Birth. Why is this important to the show? Because they're Claire Bennet's children who were sent back in time to prevent Renautas Corporation from exploiting them and because if the twins were raised together, his original ability of power absorption would have stolen his sister's ability as well. Their mother died in childbirth because he had inadvertently absorbed her regeneration.

A well done aversion with Hansel and Gretel in Once Upon a Time. Although they're said to be twins, they have different hair colours and Gretel is noticeably taller than her brother.

Myths & Religion

The Bible has Jacob and Esau. Esau is described as covered in red hair even as a baby, while Jacob was plain and smooth-skinned. Since Esau was born first (by a minute or so), he was treated as the firstborn and was supposed to receive the birthright, until Jacob bought it from him.

The Sun God Apollo and Moon Goddess Artemis (children of Zeus and the goddess Leto)

When Zeus had sex with the married mortal Ledo, she's described as giving birth to two sets of twins. The first set was Castor (son of Ledo's husband Tyndareus) and Pollux (son of Zeus). The second was Clytemnestra (daughter of Tyndareus) and Helen (daughter of Zeus).

Heracles and his brother Iphicles was another example of twins, one from Zeus and one from the mom's mortal husband. Zeus certainly got around!

The twin sons of Medusa and Poseidon. One, Chrysaor, is human in appearance; the other is Pegasus.

Kermit the Frog and Fozzie Bear in The Great Muppet Caper — but don't try telling them they're not identical, nor even the same species.

Radio

Among Bob & Ray's stable of characters were non-identical twins Claude and Clyde McBeeBee, whose trademark was to Speak in Unison but just slightly out of sync with one another, creating an echo effect.

Video Games

Alexander and Rosella from King's Quest. Alexander is dark-haired, dark-eyed, and medium-skinned, while Rosella is fair-skinned and blonde and blue-eyed. This also carries over to the remake, King's Quest (2015).

For a series that's so out of touch with reality, you wouldn't expect Super Mario Bros. to feature realistic fraternal twins, but the heroes are, in fact, same-sex twins that look similar enough that they're clearly related, but different enough that they're easy to tell apart. Luigi was originally a Palette Swap of his brother, yet the Mario Bros. weren't canonized as twins until long after Luigi gained a more individual design.

The Sims 2 has a mechanic resetting how the parents' genetics and features are mixed after every birth, including between twins. Identical twins are thus impossible unless that mechanic is glitching (which is not uncommon).

However, you can create identical twins in Create-A-Sim and Angela and Lilith Pleasant are existing identical twins.

While they are half identical in Final Fantasy IV, by The After Years, twins Palom and Porom have grown to look very different. Their earlier similarities can be justified by them originally being very young children, with puberty making their differences much more obvious.

Twin brothers Sabin and Edgar Figaro of Final Fantasy VI have a certain family resemblance, but greatly different hairstyles and builds (Edgar has long hair and an average build, Sabin has short-cropped spikes and is built like a bear) mean that no one is likely to mistake them for one another. Whether they are fraternal twins or genetically identical ones who just happened to develop differently is not explored.

Inverted in Mass Effect 2; Miranda and her sister Oriana are genetically identical, but look drastically different as Oriana was created sixteen years after Miranda. Miranda was 35 years old as of Mass Effect 2, whereas Oriana was only 19.

Mass Effect: Andromeda has Scott and Sara Ryder, a pair of opposite sex fraternal twins, one of whom is the player character (the player chooses which one to play as). While they do look alike on account that they're siblings, they're still fairly distinct enough from each other that they don't fall into Half-Identical Twins.

The Yorigami sisters from Touhou are twins, but their appearances and outfits are very distinct from one another, along with Shion being taller than Jo'on. To drive it further home, they're also Polar Opposite Twins.

Hawke, the protagonist of Dragon Age II, has younger twin siblings Bethany and Carver. Although they look similar, they are nowhere near Half-Identical Twins; Carver is taller and has blue eyes in a more square-shaped face, while Bethany is brown-eyed and rather delicately featured. They're also Polar Opposite Twins in terms of disposition; even the game makes note of their Red Oni, Blue Oni natures by giving Carver a reddish background in his icon while Bethany's is bright blue.

Visual Novels

Kyou and Ryou Fujibayashi of CLANNAD are similar to Kagami and Tsukasa Hiiragi in that Ryou has Tareme Eyes and Kyou has Tsurime Eyes. Though they're more alike than most fraternal twins with similar colored hair and eyes. In the OVA for Kyou's route it takes Tomoya several minutes to realize that he's talking to Kyou and not Ryou after she cut her hair.

In Dangan Ronpa, Mukuro Ikusaba and Junko Enoshima are fraternal twin sisters who look enough like each other with the right hairstyle, makeup and clothing that they can pass for each other, a fact used to switch Ikusaba for Enoshima, but there are enough physical differences like Ikusaba's Youthful Freckles that she has to brush off as being the result of her photographs being retouched when Naegi comments on it. If not using tricks, it's hard to tell that they are twins at all, considering that Enoshima has blond Mega Twintails, round blue eyes, big breasts and ceramic skin while Ikusaba has short black hair, narrow grey eyes, smaller breasts and greyish pale skin. And even if Enoshima's blond hair ist just dyed, her real hair color (red) would still be different from her twin sister's.

Sofiya and Natalya from Missing Stars have a Strong Family Resemblance but still look quite different from one another. Sofiya is quite a sum shorter than Natalya, wears her hair much longer, and their facial features are different. Their eye colours are also different (with Sofiya having green eyes and Natalya having blue).

Web Animation

North and South Dakota from Red vs. Blue are a quirky example. They don't look that much alike out of their armor aside from both having white-blond hair, but when suited up their armor is near-identical compared to the other Freelancers.

Web Comics

Alex and Dan in The Dreamland Chronicles are a rare case of fraternal twins of the same gender. This is likely inspired by the creator's fraternal twin sons.

Shotgun Shuffle has statuesque blonde Ellie and her petite black-haired sister Cinnamon. Of the seven Buckingham sisters Ellie and Cinnamon resemble each other the least in both looks and personality despite being the only twins. Since Cinnamon is generally referred to as "the dumb one" Ellie is constantly annoyed that they're twins.

Hiroki and Masuji in Seiyuu CRUSH! are fraternal twin brothers who are opposites in looks and personality. They are shown quarreling a lot when they first appear, but later another kind of relationship is revealed.

Apu and his wife have octuplets, courtesy of fertilization injections. At least one future episode revealed each of those 8 children would go on to have 8 children each, making 64 in total.

The Venture Bros. has two sets of fraternal twins. Thaddeus & Jonas Junior, and Hank & Dean, the latter two being the title characters.

Jackal and Hyena of Gargoyles both have brown hair and are completely Ax-Crazy, but that's where the similarities end.

In Transformers several characters are twins, and there's usually at least one pair in each continuity. However, they are never identical - at the very least they have strikingly different colours like Jetfire and Jetstorm in Transformers Animated and other times they look different in many other ways, like Sideswipe and Sunstreaker in G1 - who even had radically different personalities. This is obviously for the purpose of making and selling more toys. Family relationships are actually rarely used to explain the Palette Swap characters, who get a more technical explanation if it's explained at all.

Hurricanes: Helmut and Yorg Beethoven. Helmut is taller and Yorg is more muscular.

The Amazing Spiez: Marc and Megan are twins, but they don't look any more related than they do compared to their older and younger brothers, and since the shows' focus is on the team as a whole the fact that they are twins is barely ever brought up or used as a plot point.

Steven Universe: Whether Jenny and Kiki are supposed to be identical or not is up for debate. They would never be mistaken for one another, but the differences are in their hair (which could just be a matter of styling it differently) and clothing, while their faces are the same shape.

It's noted in The World of David the Gnome that gnomes always have twins when they have children. The trope is both played straight and subverted, however; some of the twins shown in the cartoon are identical, while others are fraternal.

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